Plow bottom



Feb. 7, 1939,.-- c. v. Br-:cKsTRoM PLOW BOTTOM Filed Nov. 12,- 1936 ATTORNEY S f Pefented Feb. 7, 1939 Carl V.'Beckstrom, Molinelvll., assigner to Deere gnCompany, Moline, Ill.,A a.- corporation of llois Application November 12, 1936, serial No. 110,497 1o Claims. (Cher- 113) I 'The present inventionrelatesgenerally to plcws and more particularly to plow bottoms Yhaving quickly detachable shares;

yThe principal object of my inventionL is tovprovide improved means for attaching the share to thefrog of the plowloottom.y e

Figure 1 is a perspective view of'the underside vTA further object is toprovide attaching means which' strengthens rather than weakens the plow structure.

' hereto in which: Y

' 0f a D10W bottom embodying the principles of my zinventiom and 5 e Y f I 'Y `Figure 2 is a similarview but with certainporf ftionswbrokenf away to more clearly Show the detailsv of construction. f

Y The frog comprises aheavy metallic'plate which isgbent to provide a slightlyy curved mainy sup` *1l-posed inlangular relation to the maine portion 6. Y The moldboard 3 is rigidly bolted to the main pori z tion rl of the frog 5 by bolts 8.vr The landside 4` is l porting portion 6 and a landside portion 1 disrigidly attached` to the landside portion .1 of the :frog 5 by means -of several bolts 9v 'securedlbyf Asuitable nuts. The landside y4, as illustratedgis Vprovidec'lr with a detachable heel IllV of lconvenopposite longitudinally extending edge I4 being adapted to t closely in' juxtaposition with the lower edge'of the moldboard 3.

,n Along one edge ofthe share is a landsidepori vtijon I5 of generally conventional shape, disposed at an angle to the blade portion I2. Thelandside I5 and o-ne cornerof the blade portionaIZ are .drawn out to provide the .usual sharepointv I6.

After'ethe landside #and themoldboard 3 are bolted in proper position on the yfrog 5, the share '2 v l is adapted to take a position on the frog .with the 'y blade portion I2 in contact Withthe main supi in) portingportion 6 of thefrog and thel landsidek Y portion I5 of the sharein contactwith the landside portion 5 of the frog and in alignmentwith 4the landside 4,'the tting edge lI4 of the share lying in juxtaposition to thelowergedge ofthe l Other objects will be made apparent Lby'fa consideration of the following speciiication-v taken in conjunction with the drawing appended( Referring to the drawing, the plow bottom I.' comprises 'generally a share 2, a moldboard 3,'ffa Y landside 4 and a `frog 5 which supports 4the other I y members-in proper position relative to each other. A

- strengthened the'frog point against downward bending. Although 'this construction requires axis of which is substantially/parallel to the landvInolrlboardVil. I Thusthe main supporting portion Iiv of the frog underlies both the moldboard 3 and the blade portion I2 of the share, while the landf side portion 5 of the frog supports the landside 4 and `the landside portion I5 of the share in properaligmnent ande in suitable angular position 5 to the blade-the point I1 of the frog extending into the angle between the blade and the landside portion ofthe share toward the point I6 of the share. l

Heretofore it hask been common practice to provide an inwardlyprojecting lug on the landside portion of the share which engages a cooperative slot' cut in the landside portion of the frog near the point I1 'of the frog. It is well known to those skilled in the'art, however, that during plowing the point ofthe vfrog is subjected tosevere strains',for the reactionpof th'e'earthl upon the point of the share ten'ds to turn the latterdownward into the ground and thus bend the point of the frog downwardly. Since it is obviousthata `large slot disposed very near to the point ofthe frog has a weakening effect thereon and' frogs Yhave been known to bend at this point under severe conditions of plowing, in the present invention -I have remedied this condition by providing anffoutwardly turned elongated 'flange'120 along 'the' landside portion 1 of the `2| extending longitudinally of the landside portiony I5 substantially parallel to the bottom edge thereo'fl. This groove 2| is adapted to receive the flange on the frog, the flange and groove fitting ytogether snugly to provide one means for attachingthe share to the plow bottom. By this simple construction yI have not only eliminated the slot: in the point of the frog, but by the provision of the .extrav ilange 20 I have greatly the .-gro'ove 2I inthev landside portion of the share, this portionis'appreciably thicker and the frog is therefore not weakened to the same extent. To furthenstrengthen point I1 of the frog against bending, a dome-like bulge 22 is pressed ino the main supporting portion 6 of the frog near the point I1. 'I'his jbulge is convex on the bottom of the frog-andis velliptical in form, the major side portion 1 of the frog.

The blade portion :I2 of the share 2 is Secured yto thepvfroglby. means of a draw bolt 25 which engagesn a stud Arivet-,26 yfixed in the blade I2 near jthelitting edgehllffof lthe share, the bolt extending upwardly to an anchorage on the frog. This anchorage comprises a portion partly cut from the plate and bent outwardly to form a lug 21. An aperture 28 is provided in the lug 21 to receive the draw bolt 25. The end of the draw bolt is threaded and is provided with a nut 24 which bears against the lug 21. The stud rivet 26 is preferably stamped from a metallic plate andY is provided with an undercut inclined camming surface 29, which is disposed on the side toward the cutting edge I3 of the share, converging relative to the surface of the blade |2 toward the tting edge I4 of the share. A second surface 30 on the stud 26 extends from the inner edge of the inclined surface 29 and substantially perpendicular thereto to the surface of blade 5. The draw bolt 25 is in the form of an eyebolt having a flattened head 3| Within which is disposed an aperture 32 adapted to receive the stud 26. The

. tip 33 of the head 3| is bent at an angle tothe head to provide an inclined camming surface 34 adapted to cooperate with the undercut camming surface 29 of the stud 26.

A slo-t or notch 35 is cut in the main supporting portion 6 of the frog to receive the stud rivet 26, the frog extending past the rivet and terminating substantially at the middle of the share. The edge 36 of the frog plate at the inner end of the slot 35 constitutes a fulcrum for the draw bolt 25, which lies overthe edge 36 in contact therewith. Since the edge` 36 lies close to the stud rivet 26, the head 3| of the draw bolt when engaged under the stud rivet and lying over the edge of' the plate is disposed at an acute angle to the surface of the blade. The shank of the draw bolt 25 is therefore bent at a point 31 above the fulcrum substantially parallel to the surface of the supporting portion 6 Aof the frog to bring it; into alignment with the aperture l28 of the lug 21. v

The bolt 25 is installed by inserting the threaded end through the aperture 26, then placing the head 3| over the stud rivet 26. The nut 214 is then applied to the threaded end of the bolt and by turning the nut against the lug 21, the bolt is drawn upwardly, or to the right as viewed in the drawing, until the Gamm-ing surface on the tip 33 of the bolt head engages theundercut camming surface l29 von `the stud rivet. Further tensional force on the bolt acting through the camming surfaces raises the share into contact with the supporting portion 6 of the frog, caulsingv the shank of the bolt to bear upon the fulcruin edge 36. By increasing the tensional force on the draw bolt the tip 33 of the head is forced by the coaction of the camming surfaces in a downward direction, as viewed in Fig'. 2, Vtoward the blade I2, causing the head 3| of the draw bolt to be bent in a counterclockwise direction around the fulcrum edge 36, thus setting up a wedging action which presses the share and frog firmly together. When the inner edge of the tip 33 Yof the bolt head contacts the second surface 36 of the stud rivet, a further increase of tensional force in the draw bolt acting through the second surface 30 draws the fitting edge of the share firmly into engagement with the edge of the moldboard 3. Thus a te'nsio'nal force in the draw bolt 25, obtained byfturning the nut 24 against the lug 21, is resolved into two components of force, one component acting upon the stud rivet substantially perpendicular t'o the blade of the share, holding the latter lagainst the frog and another component acting upon the rivet substantially parallel to the surface of the blade holding the tting edge I4 against the edge of the moldboard.

A third point of attachment of the share to the frog is provided by a bolt 4|] near the rear end of the blade, close to the fitting edge I4. A second notch 4| in the edge of the frog plate is disposed to embrace the bolt 40 when in attached position, and a nut 42 acting againsta washer 43 which bears upon the frog plate, secures the rear end of the share to the frog.

The share is quickly installed on the frog by first engaging the slot 2| in the landside portion with the flange 20 at the point of the frog, then slipping the head of the draw bolt over the stud rivet and tightening the nut 24, after which the nut 42 is tightened against the washer 43.

A diagonal bracing member 45 is provided between the landside portion 1 and the main supporting plate 6 of the frog for insuring rigidity between the parts. This brace is in the form of a rod, the ends of which are flattened and apertured to receive one of the bolts 8 of the main plate 6 and one of the bolts 9 in the landside portion of the frog. Further strengthening between the two angularly spaced-portions of the frog is provided by a pair of spaced bulges 46 pressed inwardly on the apex of the frog. An-

other diagonal bracing member 41 is provided between the tip of the moldboard 3 and the plow beam (not shown) which is attached to the landside portion 1 of the share by suitable bolts for which apertures 48 in the frog are provided. This brace is of conventional type and is provided with conventional means indicated at 49 for adjusting it relative to the moldboard.

-I claim:

1. In a plow body a detachable share comprising a blade portion and a landside portion disposed in angular relation to said blade portion, there being an elongated groove in said landside portion, and a frog comprisingva plate adapted to lie along the blade portion of .said share for supporti-ng the same, said plate being bent to t within the angle enclosed by said portions of the share to provide a supporting and reinforcing side plate adapted to lie against said landside portion of said share, a portion of one edge oi said side plate of said frog being turned to provide a ange, said flange being adapted to fit within the groove in said landside portion of the share.

2. In a plow comprising blade and landside members Adisposed in predetermined relative angular relation, a frog comprising a plate formed to flt within the angle enclosed by said members for supporting and reinforcing the same, said frog having one edge turned outwardly to provide a flange adjacent the point of the frog for reinforcing the point against bending, said flange being adapted to engage said landside portion providing means for securing ,saidr frog, to saidlandside.

B. In a plow comprising a share and a frog adapted to underlie and support said share, means for Securing said share to said frog comprising a studfixed to said share and a draw bolt anchored on said frog andr engaging said stud, said stud and said bolt having 'cooperative camming surfaces whereby a tensional force applied to said bolt is resolved into components including a component acting substantially parallel to the axis of the -stud and hence tending to hold said share againstsaid frog.

4. In a plow comprising a moldboard, a den' and support said moldboard and said share, means for ,fixing said moldboard to said frog, yand means A for securing said share to said frog comprising` a stud fixed to said rshareand a draw bolt anchored to said frog and engaging said stud, said stud and said bolt having cooperative camming sury yfaces whereby a tensional' force applied to said to the surface of said share to hold the same in lall! boltis resolved into a component acting substantially perpendicularly to the surface of said .share to hold the same against said frog, and

another component acting substantially parallel abutment with said moldboard.

5. In a plow comprisingy a share and a frog adapted to underlie and support said share, means for securing said share to said frog including a stud fixed to said share and a draw bolt anchored to said frog andextending over Athe edge of the latter to said stud, there being cooperative camming surfaces associated with saidstudand said bolt, respectively, whereby a tensional force applied to said bolt acts through said camming surfaces toforoe the end of said bolt toward said share and thus bending the bolt over the edge of the frog. f y

6. In a plow comprising a share and a frog adapted tounderlie and support said share, f means for securing said share to'said frog including la stud fixed to said share, adraw bolt engaging said stud and lying over and ,bearing upon the edge of said frog, and a lug on.- said frog for attaching said draw bolt thereto, said study having an undercut inclined surface converging with the surface of said share toward the tting edge of the share, said draw bolt having a v cooperative inclined surface adapted to contact f *y said surface on said stud.V

7. In a plow body having a frog, a moldboard,

K and a detachable sharecomprising a blade por- 'V40 tion'and a landslide portion, said 1andside p0rtion having an elongated depression disposed substantially parallel to the bottom edge thereof, means for locking the share to the frog comprising an outwardly turned iiange on said frog adapted to fit within said depression in said landside portion, a stud rivet fixed to the bottom of said blade portion, said stud rivet having a camming surface disposed at an acute angle to the axis of said rivet, and a draw bolt having a camming surface at one end thereof disposed in cooperation with said camming surface on said stud, said bolt extending over the edge of said frog to a point of attachment near the other end v of said bolt, whereby a tensional force on said bolt acting through said camming surfaces forces the end of said bolt toward said share and thus causing the side of the bolt to bear upon the edge of said frog.

8. As an article of manufacture, a plow frog comprising a wrought metal plate, one edge of said plate adjacent the point of the frog being turned to provide a flange adapted to fit within a suitable recess in another member of a plow body for the purpose of attaching said member and said frog together.

9. As an article of manufacture, a plow frog comprising a metal plate, a portion of one edge of said plate adjacent the point of the frog being extended to provide an integral projecting tongue adapted to intert with other parts of a plow body in assembly. 10. As an article of manufacture, a plow frog comprising an integral metal plate having a main supporting portion and a landside portion turned at an angle to said main portion, a portion of one edge of said landside portion being turned out of the plane of said landside portion to provide a locking tongue, adapted to interlock with other parts of a' plow body in assembly.

CARL V. BECKSTROM. 

